Oh, I see.... though the fan on a 6 cyl and a V8 are at the same place in a W111 engine bay, I believe.

Strange they fitted a 6 cylinder in a W110 body when they had the W111 body...

I saw these water tanks on Pagodas and my '72 BMW 3.0 CSI also has one (replaced by a platic one on later models). Try to see with the BMW crowd if they can get you one.